<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>

<div class="container jz">
    <h1>学员信息表</h1>
    <p>1804</p>
    <h5>添加</h5>
</div>

<main>

    <div class="container">

     <div class="row">
         <div class="col-md-3">
             <input type="text" placeholder="姓名" id="n">
         </div>
         <div class="col-md-3">
           <select id="s">
               <option>男</option>
               <option>女</option>
           </select>
         </div>
         <div class="col-md-3">
             <input type="text" placeholder="年龄" id="a">
         </div>
         <div class="col-md-3">
            <button id="btn">添加</button>
         </div>
     </div>
        </div>
    <div>
    </div>
</main>
<div class="main-3">
    <div class="container">
        <h2>列表</h2>
    </div>
</div>
<div class="main-1">
    <div class="container">
        <ul class="lk">
            <li>姓名</li>
            <li>性别</li>
            <li>年龄</li>
        </ul>
        <ul id="list"></ul>
    </div>
</div>
<script src="js.js"></script>
</body>
</html>